We had Blockbuster at Home (DVDs in the mail) as part of our Dish Network subscription. We would often wait a week, sometimes 2 or 3 weeks to get a replacement movie. The first time we called to complain, we were told we had to have at least 10 movies in our queue to get a movie!
After that, we always kept 10-20 movies in queue. Finally, we waited more than a month to get our next movie. We called, and were told to add "10 more" movies, if we expected to have one sent.
This was included in a Dish Network package that included a few extra channels. Though we are pleased with Dish as a whole, Blockbuster at Home was awful. We cancelled, and switched to Netflix. We now get two or three movies a week.
We like Blu-Ray discs for the full 7.1 channel sound. Getting them thru Dish/Blockbuster is a scam.